About the company that makes those wee smiley face satisfaction terminals that you see at airports. Simplicity of feedback triumphed by the volume you get and by using many of them across a building you can do fairly sophisticated analysis

HappyOrNot was founded just eight years ago, but its terminals have already been installed in more than a hundred countries and have registered more than six hundred million responses—more than the number of online customer ratings ever posted on Amazon, Yelp, or TripAdvisor. HappyOrNot is profitable, and its revenues have doubled each year for the past several years; its clients have a habit of inquiring whether, by chance, the company is for sale—significant accomplishments for a still tiny enterprise whose leaders say that their ultimate goal is to change not just the way people think about customer satisfaction but also the way they think about happiness itself.

Audio: Listen to this story. To hear more feature stories, download the Audm app for your iPhone. In 2016, a European gas-station chain hired HappyOrNot, a small Finnish startup, to measure customer satisfaction at its hundred and fifty-plus outlets. via Pocket